refactor GemVersion

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

src/univers/gem.py

@@ -199,19 +199,14 @@ def __init__(self, version):
         if not self.is_correct(version):
             raise InvalidVersionError(version)
 
-        # If version is an empty string convert it to 0
         version = str(version).strip()
-
         self.original = version
 
+        # If version is an empty string convert it to 0
         if not version:
             version = "0"
 
         self.version = version.replace("-", ".pre.")
-        self._segments = ()
-        self._canonical_segments = ()
-        self._bump = None
-        self._release = None
 
     def __str__(self):
         return self.original
@@ -242,6 +237,32 @@ def __gt__(self, other):
     def __ge__(self, other):
         return self.__cmp__(other) >= 0
 
+    @property
+    def segments(self):
+        """
+        Returns segments for this version where segments are
+        ints or strings parsed from the original version string.
+        """
+        segments = []
+        find_segments = re.compile(r"[0-9]+|[a-z]+", re.IGNORECASE).findall
+        for seg in find_segments(self.version):
+            sub_segments = [int(seg) if seg.isdigit() else seg]
+            segments.extend(sub_segments)
+        return tuple(segments)
+
+    @property
+    def canonical_segments(self):
+        """
+        Returns  "canonical segments" for this version using
+        the Rubygems way for canonicalization.
+        """
+        canonical_segments = []
+        for segments in self.split_segments():
+            # drop the section preceding the least significant zero (if exists)
+            segs = list(dropwhile(lambda s: s == 0, reversed(segments)))
+            canonical_segments.extend(reversed(segs))
+        return tuple(canonical_segments)
+
     def bump(self):
         """
         Return a new version object where the next to the last revision number
@@ -252,40 +273,33 @@ def bump(self):
         >>> assert GemVersion("5.3.1").bump() == GemVersion("5.4"), repr(GemVersion("5.3.1").bump())
         >>> assert GemVersion("5.3.1.4-2").bump() == GemVersion("5.3.2"), GemVersion("5.3.1.4-2").bump()
         """
-        if not self._bump:
-            segments = []
-            for seg in self.segments:
-                if isinstance(seg, str):
-                    break
-                else:
-                    segments.append(seg)
-
-            if len(segments) > 1:
-                segments.pop()
+        segments = []
+        for seg in self.segments:
+            if isinstance(seg, str):
+                break
+            else:
+                segments.append(seg)
 
-            segments[-1] += 1
-            segments = [str(r) for r in segments]
-            self._bump = GemVersion(".".join(segments))
+        if len(segments) > 1:
+            segments.pop()
 
-        return self._bump
+        segments[-1] += 1
+        segments = [str(r) for r in segments]
+        return GemVersion(".".join(segments))
 
     def release(self):
         """
         Return a new GemVersion which is the release for this version (e.g.,
         1.2.0.a -> 1.2.0). Non-prerelease versions return themselves. A release
         is composed only of numeric segments.
         """
-        if not self._release:
-            if self.prerelease():
-                segments = self.segments
-                while any(isinstance(s, str) for s in segments):
-                    segments.pop()
-                segments = (str(s) for s in segments)
-                self._release = GemVersion(".".join(segments))
-            else:
-                self._release = self
-
-        return self._release
+        if self.prerelease():
+            segments = list(self.segments)
+            while any(isinstance(s, str) for s in segments):
+                segments.pop()
+            segments = (str(s) for s in segments)
+            return GemVersion(".".join(segments))
+        return self
 
     def prerelease(self):
         """
@@ -294,47 +308,6 @@ def prerelease(self):
         """
         return any(not str(s).isdigit() for s in self.segments)
 
-    @property
-    def segments(self):
-        """
-        Return a new sequence of segments for this version where segments are
-        ints or strings parsed from the original version string.
-        """
-        if not self._segments:
-            self._segments = self.get_segments()
-        return list(self._segments)
-
-    def get_segments(self):
-        """
-        Return a sequence of segments for this version where segments are ints
-        or strings parsed from the original version string.
-        """
-        find_segments = re.compile(r"[0-9]+|[a-z]+", re.IGNORECASE).findall
-        segments = []
-        for seg in find_segments(self.version):
-            if seg.isdigit():
-                seg = int(seg)
-            segments.append(seg)
-        return tuple(segments)
-
-    @property
-    def canonical_segments(self):
-        if not self._canonical_segments:
-            self._canonical_segments = self.get_canonical_segments()
-        return list(self._canonical_segments)
-
-    def get_canonical_segments(self):
-        """
-        Return a new sequence of "canonical segments" for this version using
-        the Rubygems way.
-        """
-        canonical_segments = []
-        for segments in self.split_segments():
-            segs = list(dropwhile(lambda s: s == 0, reversed(segments)))
-            segs = reversed(segs)
-            canonical_segments.extend(segs)
-        return tuple(canonical_segments)
-
     def split_segments(self):
         """
          Return a two-tuple of segments:
@@ -380,11 +353,11 @@ def __cmp__(self, other, trace=False):
         if self.version == other.version:
             return 0
 
-        lhsegments = self.canonical_segments
+        lhsegments = list(self.canonical_segments)
         if trace:
             print(f"  lhsegments: canonical_segments: {lhsegments!r}")
 
-        rhsegments = other.canonical_segments
+        rhsegments = list(other.canonical_segments)
         if trace:
             print(f"  rhsegments: canonical_segments: {rhsegments!r}")
 

tests/test_rubygems_gem_version.py

@@ -168,22 +168,22 @@ def test_semver():
 
 def test_segments():
     # modifying the segments of a version should not affect the segments of the cached version object
-    ver = GemVersion("9.8.7")
-    secondseg = ver.segments[2]
+    ver_segment = GemVersion("9.8.7").segments
+    secondseg = ver_segment[2]
     secondseg += 1
 
     refute_version_eql("9.8.8", "9.8.7")
-    assert GemVersion("9.8.7").segments == [9, 8, 7]
+    assert GemVersion("9.8.7").segments == (9, 8, 7)
 
 
 def test_split_segments():
     assert GemVersion("3.2.4-2").split_segments() == ([3, 2, 4], ["pre", 2])
 
 
 def test_canonical_segments():
-    assert GemVersion("1.0.0").canonical_segments == [1]
-    assert GemVersion("1.0.0.a.1.0").canonical_segments == [1, "a", 1]
-    assert GemVersion("1.2.3-1").canonical_segments == [1, 2, 3, "pre", 1]
+    assert GemVersion("1.0.0").canonical_segments == (1,)
+    assert GemVersion("1.0.0.a.1.0").canonical_segments == (1, "a", 1)
+    assert GemVersion("1.2.3-1").canonical_segments == (1, 2, 3, "pre", 1)
 
 
 def test_frozen_version():